Electric low-speed unit



July v *1115927 o. CULLMAN ELECTRIC Low SPEED UNIT Filed Aug.4. 192e 2 sheets-Sheet 1 Jury 26, 1927.

o CULLMAN ELEGTRC LOW SFEED'UNIT 2 Sheets-Sheet 2 Filed Aug. 4. 1926 Patented July 26, 1927.

o'rro cULLMAN, or CHICAGO, iLLINois.

P-ATENT'- OFFICE.

vELECTRIC Low-SPEED UNIT. .Y

Application med Agst 4, 192s. semi no. 127,0'24.,y

i This invention relatesjto a device kthat re? duces or steps down, the high speed of electric motors to the speed requiredA for mal chines or for special purposes.

Among the objects ofthepinvention is to obtain an efficient, economical, durableand compact machine which can be mounted direct on machines or-machine tools.` An ad# ditional object is` to obtain a device of the kind named which can be mounted on the floor. An additional object is to obtain an electric low vspeed unit adapted `to be asso` ciated with` an electric motor in such manner as to4 permit perfect adjustment between the unit and the motor, and at the same time to allow the motor to be removed without dis# turbing any mechanical connections of the driven shaft of the unit. A further object is i to obtain an electric low speed unit in which all the gears, sprockets, chains and bearings will be automatically oiled, so long as a determined quantity of oil is contained in the housing 'or shell of the device.

I have illustrated an electric low speed unit in the drawings referred to, in which Fig. 1 is a top plan view of the housing of the device and of the motor table associated therewith. l

Fig. 2 is an end elevation of said housing and table, with an electric motor indicated by broken lines on said table; and y Fig. 3 is a horizontal section of the device, on line 3-3 of Fig. 2, viewed as indicated by arrows.

A reference character applied to designate a given part indicates said part throughout the several figures of the drawing wherever the same appears.

1 represents the housing of the unit. 2 represents an inwardly extending annular flange at the open end of the housing. The housing, being provided withsaid flange 2 is adapted to contain a considerable quantity of oil when the end (5) is not in place, and the lubrication of the severaly movableparts of the device contained in thehousing is thus provided for. 3 represents an annular flange which is provided with screw threaded apertures to receive bolts 4. V5 represents a separable end to housing 1,y which is secured in place by bolts 4. 6 represents an adjustable table adapted to'form a basel for an electric motor, said motor being indicated by broken lines X, (Fig. 2), as mounted thereon. 7 represents a `bolt on which the 7, and may be adjusted,longitudinally there? onby interposingy a suitable number f of washers 11, thereon, between the end of table 6 and said housing. Vhen saidtable is longitudinally and rotatably adjusted on bolt 7 it is rigidly secured in its adjusted posit-ion by said nut 8 being turned tightly to: place. To avoid anypossible turning of said table on said bolt the set 'screw 12 is provided which extends through la screw threaded aperture provided therefor adja4 cent to one endof table 6 with the end thereof set against the under side of abutment 13, on the housing. Table 6 is provided with screw threaded apertures 14, (Fig. 1), into which bolts, to secure the electric motor placed thereon rigidly in place, extend. V15 represents a shaft of an electricfmotorand 16, (Figs. 2 and 3), a sprocket pinion which is rigidly secured on said shaft to'fturn therewith. 17 represents a shaft which is rotatably mounted in journalV bearings 18, and 19 a sprocket wheel which is rigidly mounted on shaft 17. 2O represents a sprocket chain which extends over sprocket pinion 16 and sprocket wheel 19. Thev sprocket pinion 16 is adjustable in line with sprocket wheel 19 by interposing said washers 11 between the table 5 and the housing 1, said washers being mounted on bolt 7; and

said sprocket pinion is moved to obtain suitable tension on sprocket chain`20 by turning said table on said bolt before the nut 8 and the set screw 12 are turned into position, to hold said table rigidly in place. 21 represents a gear pinion which isrigidly secured on shaft 17. 22 represents shafts which are rotatably mounted in journal bearings 23, 24. 25 represents gear wheels .which are, respectively, rigidly secured on a shaft 22,so that` the gear teeth thereof mesh with the teeth of gear pinion 21. 26 represents gear pinions which are rigidly mounted on shafts 22, respectively. 27 represents a shaft which is rotatably mounted in journal bearings28; and 29 represents a gear wheel which is rigidly mounted on shaft 27. Shafts 22 zare arranged relative to the shaft 27 so that the several gea-r pinions 26 are in mesh With the gear Wheel 29.".u "The housing'l lis provided Withthe feetorlugsdhaving apertures 3l, throughl which bolts may be extended Ato secure the said housing ingralfplzedetelmned position.

32 represents a removable cover placed over an yaperture on the top, of the housing, through which lubricant," `asl oil, *may 'be poured into the housing, as required. {Ibla-iin; c j

1. A housing, a plurality of central shafts rotatably journaled in said housing, a `plurality of additional shafts rotatably journalediin said housing, a sprocket wheel and a means to adjust it toa vdetermined distance from said sprocket wheel.

2. housing, a plurality'of central shafts rotatablyfjournaled in said housing, reducing gears ,Inorinted `on shafts in `said housing, a sprocket wheel rigidlymounted on one of saidy central shafts, `all in, combination i with and #with an inwardl a motor shaft extending into said housing, a -lsproc'ket'pinion rigdlygmountedioh said mdtor shatmnd a sprocket chain connectinfr said sprocket pinion and said sprocket whec means., to 4adjhistqsaid sprocket pinion laterally and means to adjust it to a determined dista-nce .from said sprocket Wheel.

3. A housing provided with an open end extending annular flange at said open en in combinationwith a cover vadapted yto fclosesaid open end, said coverprov'ided vwith annular flanges on said cover arranged to form journalbearings for a plurality of rotatable shafts, andwith apen tures adjacent to its `periphc-:ral edge, said housing provided with an additional annular flange (3L/provided with screw threaded holes, andfbo'lts adapted to extend through` said apertures in said cover and into said screw threaded. holes.

4. A housing provided-with an open end and with an inwardly `extending annular flange Yadjacent to said openV end, andjournal bearings in said housin in combination with a cover adapted to c ose said openend and annular flanges on said cover arrange to form a plurality of journal bearings, said cov'er )rovided With a Jertures adjacent to its perip eral edge,said housing provided with an additional annular flange 3), and said llange provided with screxv threaded holes, and bolts adapted t0 extend throughsaid aperturesin said cover Vand Ainto vsaid `screw threaded holes.

orroy CULLMAN. 

